There are six floors our school building. Our class is the third floor. A. in on B. in

问题补充：

There are six floors our school building. Our class is the third floor.

A. in, on

B. in, in

C. on, in

D. on, on

答案：

(答案→)A. in, on

B. in, in

C. on, in

D. on, on

解析：句意：我们的学校教学楼有六层。我们班在三楼。In表示所属，on表示具体位置在三楼上；故选A。